CN110752810A - Digit adjustable voice coil motor drive circuit - Google Patents
Digit adjustable voice coil motor drive circuit Download PDFInfo
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- CN110752810A CN110752810A CN201911064367.9A CN201911064367A CN110752810A CN 110752810 A CN110752810 A CN 110752810A CN 201911064367 A CN201911064367 A CN 201911064367A CN 110752810 A CN110752810 A CN 110752810A
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- circuit
- operational amplifier
- resistor
- voice coil
- coil motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/032—Reciprocating, oscillating or vibrating motors
- H02P25/034—Voice coil motors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Linear Motors (AREA)
Abstract
The invention discloses a digital adjustable voice coil motor driving circuit, which comprises a digital isolation circuit, a DA conversion circuit, an amplifying circuit, a feedback compensation control circuit and an output driving circuit, wherein the digital isolation circuit is connected with the DA conversion circuit; the digital isolation circuit isolates the digital control signal and then transmits the digital control signal to the DA conversion circuit, the DA conversion circuit converts the digital control signal into analog voltage, the converted analog voltage is amplified by the amplifying circuit and then transmitted to the feedback compensation control circuit, and the output driving circuit is controlled to generate voice coil motor driving voltage corresponding to the digital control signal.
Description
Technical Field
The invention relates to a voice coil motor driving circuit, and belongs to the technical field of circuits.
Background
The common driving method of the voice coil motor mainly comprises a linear driving method and a PWM (pulse width modulation) driving method. The linear driving mode is directly driven by a linear power amplifier, and has the advantages of simple control, stable output voltage, large power consumption, low efficiency and efficiency of about 30 percent. It is not beneficial to realize the input digital quantity control. The PWM driving mode has the advantages of low power consumption and high efficiency, and has the defect that the thrust generated by the PWM driving mode has a jitter phenomenon. Especially when the duty ratio of the input PWM signal is small, the jitter does not allow the voice coil motor to obtain the desired dynamic performance. Meanwhile, the PWM driving mode has larger harmonic interference.
The improvement scheme in the prior art still has the defects of different degrees, and the Chinese patent: a voice coil motor driving circuit, 2017214604580, has the disadvantage that the drive end and the control end of the voice coil motor are not isolated, and the digital control of the voice coil motor drive is difficult to realize. Chinese patent: the novel voice coil motor driver 2016214425463 has the defect that the driving end and the control end of the voice coil motor are not isolated; the driver is complicated, and the dynamic performance of driving the voice coil motor is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a digital adjustable voice coil motor driving circuit.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a digital adjustable voice coil motor driving circuit comprises a digital isolation circuit, a DA conversion circuit, an amplification circuit, a feedback compensation control circuit and an output driving circuit;
the digital isolation circuit isolates the digital control signal and then transmits the digital control signal to the DA conversion circuit, the DA conversion circuit converts the digital control signal into analog voltage, the converted analog voltage is amplified by the amplifying circuit and then transmitted to the feedback compensation control circuit, and the output driving circuit is controlled to generate voice coil motor driving voltage corresponding to the digital control signal.
Further, the amplifying circuit employs a first operational amplifier.
Further, the analog voltage V1 output by the DA conversion circuit enters the positive phase input terminal of the first operational amplifier, and the negative phase input terminal of the first operational amplifier is grounded through the tenth resistor; the output end of the first operational amplifier is fed back to the negative phase input end of the first operational amplifier through the eleventh resistor.
Further, the output voltage of the output terminal of the first operational amplifier V2 = V1 × (1+ R11/R10),
the magnification A is:
A=V2/V1=1+R11/R10
in the formula, R10 is the resistance value of the tenth resistor, and R11 is the resistance value of the eleventh resistor.
Further, the feedback compensation control circuit adopts a second operational amplifier, a reference source and a resistor;
the first operational amplifier output voltage V2 is connected with the negative phase input end of the second operational amplifier through a seventh resistor, and meanwhile, the reference source output voltage V3 is connected with the positive phase input end of the second operational amplifier through a sixth resistor R6 and a voice coil motor driving voltage VOUT output by the output driving circuit through a third resistor R3; the output end of the second operational amplifier is connected to the negative phase input end of the second operational amplifier through a ninth resistor in a feedback mode.
Further, the output voltage of the second operational amplifier is:
Vf’=R9×(V3/R6+VOUT/R3-V2/R7) （3）
in the formula, R9, R6, R3 and R7 are resistance values of a ninth resistor, a sixth resistor, a third resistor and a seventh resistor, respectively;
if R9= R6= R3= R7, the output voltage of the second operational amplifier is:
Vf’=V3+VOUT-V2 （4）
transforming equation (4) to obtain:
VOUT＝Vf’+V2-V3 （5）
the output voltage V3 of the reference source is equal to the output voltage of the second operational amplifier;
the driving voltage of the voice coil motor can be adjusted by a digital control D/A conversion circuit, and VOUT is A multiplied by V1.
The invention achieves the following beneficial effects:
the isolation between the voice coil motor driving circuit and the control circuit is realized; the driving voltage of the voice coil motor can be digitally adjusted and controlled by the control circuit through changing the voltage of the D/A conversion circuit. The device has the advantages of isolation of control and drive, stable and reliable work, easy realization of digital control and the like.
Drawings
FIG. 1 is a schematic diagram of the present embodiment;
FIG. 2 is a digital isolation circuit diagram;
fig. 3 is a circuit diagram of the present embodiment.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The circuit schematic block diagram of the isolated digital adjustable voice coil motor driving circuit of the embodiment is shown in fig. 1. The circuit comprises a digital isolation circuit, a DA conversion circuit, an amplifying circuit, a feedback compensation control circuit, an output drive circuit and the like. The digital isolation circuit isolates the digital control signal and then transmits the digital control signal to the DA conversion circuit, the DA conversion circuit converts the digital control signal into analog voltage, the converted analog voltage is amplified by the amplifying circuit and then transmitted to the feedback compensation control circuit, and the output driving circuit is controlled to generate voice coil motor driving voltage corresponding to the digital control signal.
The schematic diagram of the circuit is shown in fig. 2 and 3. The digital isolation circuit mainly comprises isolation chips N2 and N3. The DA conversion circuit employs a DA chip N1. The amplifying circuit employs an operational amplifier N2A. The feedback compensation control circuit employs an operational amplifier N2B, a reference source, and a resistor. The output driving circuit adopts a power supply chip U1.
Digital control signal: the enable signal IO _ CS, the clock signal IO _ SCLK and the data signal IO _ Din are sent to the 5-pin enable terminal SYNC, the 6-pin clock terminal SCLK and the 7-pin data input terminal Din of the DA chip N1 through the isolation chips N2 and N3. The D/A chip N1 outputs an analog voltage V1 which is output by a 4-pin output end Vout, and the voltage output range is 0-5V. The output analog voltage V1 enters the positive phase input end of the operational amplifier N2A, the output end of the operational amplifier N2A is fed back to the negative phase input end thereof through a resistor R11, and the negative phase input end of the operational amplifier N2A is grounded through a resistor R10; an in-phase proportional amplifying circuit is formed by resistors R10 and R11, and the amplified output voltage V2 is calculated according to the following formula:
V2=V1×(1+R11/R10) （1）
the magnification A is:
A=V2/V1=1+R11/R10 （2）
the output voltage V2 of the operational amplifier N2A enters the negative input terminal of the operational amplifier N2B through the resistor R7, and the output voltage V3 of the reference source VD1 enters the positive input terminal of the operational amplifier N2B through the resistor R6 and the output voltage VOUT (i.e., the driving voltage of the voice coil motor) of the power chip U1 through the resistor R3. The three inputs form an add-subtract operation circuit through an operational amplifier, wherein the feedback resistance is R9. Therefore, the calculation formula of the output voltage of the operational amplifier N2B is:
Vf’=R9×(V3/R6+VOUT/R3-V2/R7) （3）
when R9= R6= R3= R7 is selected, the output voltage of the operational amplifier N2B is:
Vf’=V3+VOUT-V2 （4）
and (5) converting the formula (4) to obtain an output voltage calculation formula:
VOUT＝Vf’+V2-V3 （5）
during design, the output voltage V3 of the reference source VD1 is selected to be equal to the feedback terminal voltage Vf of the power chip U1 as much as possible, namely V3 is approximately equal to Vf, and Vf is equal to Vf'. Substituting in equation (5) calculates VOUT ≈ V2. Therefore, it can be concluded that the output voltage value of the circuit is determined by the digital control D/A chip, and VOUT is approximately equal to AxV 1.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A voice coil motor drive circuit with adjustable number is characterized by comprising a digital isolation circuit, a DA conversion circuit, an amplification circuit, a feedback compensation control circuit and an output drive circuit;
the digital isolation circuit isolates the digital control signal and then transmits the digital control signal to the DA conversion circuit, the DA conversion circuit converts the digital control signal into analog voltage, the converted analog voltage is amplified by the amplifying circuit and then transmitted to the feedback compensation control circuit, and the output driving circuit is controlled to generate voice coil motor driving voltage corresponding to the digital control signal.
2. The digitally tunable voice coil motor driver circuit of claim 1, wherein the amplifier circuit employs a first operational amplifier.
3. The digitally tunable voice coil motor driving circuit as claimed in claim 2, wherein the analog voltage V1 outputted from the DA converter circuit is inputted to the positive phase input terminal of the first operational amplifier, and the negative phase input terminal of the first operational amplifier is grounded via a tenth resistor; the output end of the first operational amplifier is fed back to the negative phase input end of the first operational amplifier through the eleventh resistor.
4. A digitally tunable voice coil motor driver circuit as claimed in claim 3 in which the output voltage of the first operational amplifier is V2 = V1 x (1+ R11/R10),
the magnification A is:
A=V2/V1=1+R11/R10
in the formula, R10 is the resistance value of the tenth resistor, and R11 is the resistance value of the eleventh resistor.
5. The digitally tunable voice coil motor driver circuit of claim 4,
the feedback compensation control circuit adopts a second operational amplifier, a reference source and a resistor;
the first operational amplifier output voltage V2 is connected with the negative phase input end of the second operational amplifier through a seventh resistor, and meanwhile, the reference source output voltage V3 is connected with the positive phase input end of the second operational amplifier through a sixth resistor R6 and a voice coil motor driving voltage VOUT output by the output driving circuit through a third resistor R3; the output end of the second operational amplifier is connected to the negative phase input end of the second operational amplifier through a ninth resistor in a feedback mode.
6. The digitally tunable voice coil motor driver circuit of claim 5, wherein the second operational amplifier outputs a voltage of:
Vf’=R9×(V3/R6+VOUT/R3-V2/R7) （3）
in the formula, R9, R6, R3 and R7 are resistance values of a ninth resistor, a sixth resistor, a third resistor and a seventh resistor, respectively;
if R9= R6= R3= R7, the output voltage of the second operational amplifier is:
Vf’=V3+VOUT-V2 （4）
transforming equation (4) to obtain:
VOUT＝Vf’+V2-V3 （5）
the output voltage V3 of the reference source is equal to the output voltage of the second operational amplifier;
the driving voltage of the voice coil motor can be adjusted by a digital control D/A conversion circuit, and VOUT is A multiplied by V1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911064367.9A CN110752810A (en) | 2019-11-04 | 2019-11-04 | Digit adjustable voice coil motor drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911064367.9A CN110752810A (en) | 2019-11-04 | 2019-11-04 | Digit adjustable voice coil motor drive circuit |
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| Publication Number | Publication Date |
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| CN110752810A true CN110752810A (en) | 2020-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911064367.9A Pending CN110752810A (en) | 2019-11-04 | 2019-11-04 | Digit adjustable voice coil motor drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112366999A (en) * | 2020-11-02 | 2021-02-12 | 普冉半导体(上海)股份有限公司 | Voice coil motor driving circuit and method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201145864Y (en) * | 2007-12-03 | 2008-11-05 | 北京康拓科技开发总公司 | Numeric control constant-current source |
| CN105224011A (en) * | 2015-10-13 | 2016-01-06 | 中国兵器工业集团第二一四研究所苏州研发中心 | There is the rearrangeable switch constant voltage power supply circuit of digital set-up function |
| CN206259875U (en) * | 2016-12-26 | 2017-06-16 | 深圳市海普智能装备技术有限公司 | new voice coil motor driver |
| CN207460045U (en) * | 2017-11-06 | 2018-06-05 | 宁波尚进自动化科技有限公司 | A kind of voice coil motor drive circuit |
-
2019
- 2019-11-04 CN CN201911064367.9A patent/CN110752810A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201145864Y (en) * | 2007-12-03 | 2008-11-05 | 北京康拓科技开发总公司 | Numeric control constant-current source |
| CN105224011A (en) * | 2015-10-13 | 2016-01-06 | 中国兵器工业集团第二一四研究所苏州研发中心 | There is the rearrangeable switch constant voltage power supply circuit of digital set-up function |
| CN206259875U (en) * | 2016-12-26 | 2017-06-16 | 深圳市海普智能装备技术有限公司 | new voice coil motor driver |
| CN207460045U (en) * | 2017-11-06 | 2018-06-05 | 宁波尚进自动化科技有限公司 | A kind of voice coil motor drive circuit |
Non-Patent Citations (1)
| Title |
|---|
| 张加胜，张磊，马文忠编著: "《电力电子技术》", 31 May 2018, 东营：中国石油大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112366999A (en) * | 2020-11-02 | 2021-02-12 | 普冉半导体(上海)股份有限公司 | Voice coil motor driving circuit and method thereof |
| CN112366999B (en) * | 2020-11-02 | 2022-03-08 | 普冉半导体(上海)股份有限公司 | Voice coil motor driving circuit and method thereof |
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Application publication date: 20200204 |